Sr_(1−x)K_(x)Fe_(0.5)Co_(y)O_(3)催化CO_(2)加氢制烯烃性能  

Catalytic hydrogenation of CO_(2)to olefins by Sr_(1−x)K_(x)Fe_(0.5)Co_(y)O_(3)

作　　者：崔爱心 侯元浩 吴曼[1] 郭拓 郭庆杰[1,2] CUI Aixin;HOU Yuanhao;WU Man;GUO Tuo;GUO Qingjie(College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China;College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]青岛科技大学化工学院,山东青岛266042 [2]宁夏大学化学化工学院,宁夏银川750021

出　　处：《洁净煤技术》2025年第1期42-50,共9页Clean Coal Technology

基　　金：国家自然科学基金资助项目(U20A20124);国家自然科学基金资助项目(22379079);山东省自然科学基金资助项目(ZR2020MB144)。

摘　　要：CO_(2)加氢制备低碳烯烃在缓解温室效应,提高我国低碳烯烃产品自给率方面具有重要意义。然而,实现高收率的前提是开发出具有高转化率和高目标产物选择性的催化剂。为了提高低碳烯烃的收率,采用溶胶凝胶法制备了钙钛矿型Sr_(1−x)K_(x)Fe_(0.5)Co_(y)O_(3)催化剂,其CO_(2)转化率高达53.73%,低碳烯烃选择性为40.55%,收率达到21.79%。催化剂的表征表明,Co的加入增强了催化剂的中强碱性位点以及氧空位浓度,促进了CO_(2)活化,提高了催化剂的CO_(2)转化率。K的掺杂促进了费托合成反应的进行,提高了低碳烯烃的选择性。K与Co的共掺杂促进了金属活性相的析出以及C—O的解离吸附和随后的C—C偶联,从而提高了CO_(2)转化率和低碳烯烃的选择性。The preparation of light olefins by CO_(2)hydrogenation is an important way to alleviate greenhouse effect.Meanwhile,this is of great significance in improving the self-sufficiency rate of light olefin in China.However,the catalyst with high conversion rates and selectivity towards target products is a prerequisite for achieving high yields.In order to enhance the yield of light olefins,a perovskite catalyst Sr_(1−x)K_(x)Fe_(0.5)Co_(y)O_(3)was prepared by sol-gel method.This kind of catalyst have notable results with a CO_(2)conversion rate of 53.73%,a light olefin selectivity of 40.55%,and a yield of 21.79%.The characterization of catalysts reveal that the medium-strong basic sites and oxygen vacancy concentration are enhanced with addition of Co,which promote the activation of CO_(2).As a result,the conversion rate of CO_(2)has been improved.The Fischer-Tropsch synthesis reaction has been promoted with the doping of K.Thereby,the selectivity of light olefin has been improved.The precipitation of active metal phases,dissociative adsorption of C-O and facilitated subsequent C-C coupling are all enhanced by the co-doped Co/K.Thereby,CO_(2)conversion and light olefin selectivity are increased.

关 键 词：钙钛矿催化剂 CO_(2)加氢 低碳烯烃 转化率 选择性 

分 类 号：TQ52[化学工程—煤化学工程]